I have read the wikipedia article about the CDN, but i couldn't conclude to which server i am actually ping or get web pages from, is it the Akamai server or the company server ?
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Hanan N.Dec 11 '11 at 13:31

Akamai is one of the largest CDN companies in the world. CDN networks makes web sites perform faster by bringing contents closer to web sites visitors, through different technologies.

CDN can shield web sties from surges in traffic whether it was benign traffic (a site hosting a hot video), or malicious when the site is under DDoS attacks. This protection comes from the size/scalability of CDN vs a regular web sites (10000s of servers vs 10s).

For the content web sites want to be served via CDN they will create a CNAME that points to an A record that belongs to the CDN (as the output of nslookup above).